The Pacific Ocean is the largest ocean on Earth. The Pacific Ocean is also the largest single feature on Earth as it is bigger than all the land masses combined. The deepest point in the world is in the Pacific and is deeper than Mount Everest is high. The continent of Australia is on the boundary of the Pacific Ocean as are New Zealand and Tasmania. The island chain, Indonesia extends from round about China to Australia through the Pacific. There are many small islands in the Pacific. Some of them are known collectively as Polynesia.
The Pacific Rim is on the border of most parts of the Pacific and is geologically active. The geologically active rim includes heavily populated areas like California and San Francisco on the East Coast of the United States. The San Andreas Fault is notorious for earthquakes. Coastal earthquakes lead to a risk of Tsunami. Extending down South America is the volcanic mountain chain called the Andes. Japan and China on the other side of the Pacific Ocean also have volcanoes. The Japanese Mount Fuji is famous. Earthquakes and Tsunami also happen there. Indeed tsunami is a Japanese word.